i've been thinking about it a bit. The pos. battery cable goes to a connection just to the right of the battery(the one closest to the tire,which i use for boosting).Maybe take the cable off there and put it to one of them (isolater?) switches,along with the pos. cable from your second battery.I've never used one of these switches,but i think they must allow two cables to come into it ,then an output cable which could go back to the connection by the tire. Then you could switch from one battery to another.Good daytime running you could charge them up good one at a time,when the cold,poweraccessory consuming,many beveragestopping w/lights on,night comes --you'd have a fully charged back-up at the flick of a switch. Still in the theory stage.If you get-er done let us know
oops,i thought i was in the spare battery thread too...switchable ?
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